H3 cell inspector
Everything about an cell: center (cellToLatLng), boundary (cellToBoundary), resolution, base cell, pentagon and Class III checks, area, and decimal form.
The cell's center is 40.444865978°, -79.981846904°, at resolution 9.
| Latitude | Longitude |
|---|---|
| 40.446610897 | -79.982138265 |
| 40.445571073 | -79.984103105 |
| 40.443826183 | -79.983811677 |
| 40.443121097 | -79.981555564 |
| 40.444160846 | -79.979590767 |
| 40.445905756 | -79.979882041 |
- Center longitude
- Resolution
- Base cell
- Pentagon
- Class III
- Cell area
Provenance
- Computed by
- indexing.h3.cell-info 1.0.0, core 0.1.0
- Model
- H3 v4 (h3o 0.11)
- Accuracy
- Identical to H3 C; coordinates within 1e-12° below 88° latitude, 5e-11° nearer the poles; areas within 6e-15 relative at resolution 0 and 2e-8 at resolution 15, where the 1 m² cell's spherical excess runs out of digits
- Notes
- None
- Cites
- Uber Technologies and the H3 contributors, H3: A Hexagonal Hierarchical Geospatial Indexing System (API reference v4); Hydronium Labs, h3o: a Rust implementation of H3
Something look off?
How we got thisFormula, worked example, sources, and proof
Model: H3 v4 (h3o 0.11)
Accuracy: Identical to H3 C; coordinates within 1e-12° below 88° latitude, 5e-11° nearer the poles; areas within 6e-15 relative at resolution 0 and 2e-8 at resolution 15, where the 1 m² cell's spherical excess runs out of digits
When to use this: Use this when an H3 index arrives and you need to know what it is: the center, the boundary to draw, the resolution, the base cell, whether it is one of the twelve pentagons, whether it is Class III, and the cell's area. It is the first stop when debugging an H3 dataset.
Limitations: The area is that cell's own; H3 cells are not equal-area, and neighbors differ by a few percent. A boundary at a Class III resolution carries extra vertices where cells meet, and a pentagon has no sixth neighbor, which is the case most code built on hexagons forgets.
Worked example: 892a8471487ffff. Source: add-spatial-indexing-and-raster scenario: center about (40.444866°, -79.981847°). It is golden test vector v001, and every build checks the tool still gives its answer within its tolerance.
You enter
- H3 cell
- 892a8471487ffff
You get
- Center latitude
- 40.444865978°
- Center longitude
- -79.981846904°
- Resolution
- 9
- Base cell
- 21
- Pentagon
- no
- Class III
- yes
- Cell area
- 0.105332 km²
- Decimal index
- 617741122143780863
Review: Not yet independently reviewed by a GIS professional.
Last verified: 2026-09-18, when a maintainer last confirmed this tool's sources at the issuer. See the sources ledger.
Status: version 1.0.0, core 0.1.0. See this tool in the verification report.
Changes
- 2026-09-19, changed: Eight more H3 tools are stable: the cell inspector, grid ring, grid path, parent, children, compact, uncompact, and edges. On 300 cells at every resolution, one in eight a pentagon, they match H3 C exactly, including every path H3 C refuses; cell areas agree to 2e-8 relative even at resolution 15. Results are unchanged. Changelog
Checked against: 23 golden test vectors (download the test vectors, each with its source and tolerance). See how results are checked and every source.
Sources
- H3: A Hexagonal Hierarchical Geospatial Indexing System (API reference v4), Uber Technologies and the H3 contributors, H3 4.x documentation. Indexing, inspection, traversal, hierarchy, directed edges, vertexes, and resolution tables. Read free.
- h3o: a Rust implementation of H3, Hydronium Labs, 0.11.0 (tested against H3 C). CellIndex, LatLng, Resolution. Read free.
Terms
- H3: H3 hexagonal hierarchical index
- A global grid of hexagons (and 12 pentagons) at 16 resolutions, each cell about one-seventh the area of its parent, named by a 15-character index. Source: H3 hexagonal index
H3 — H3 hexagonal hierarchical index
A global grid of hexagons (and 12 pentagons) at 16 resolutions, each cell about one-seventh the area of its parent, named by a 15-character index.
Source: H3 hexagonal index
Learn the concept: How to choose an H3 resolution